What is Yom Kippur?
Yom Kippur, which in 2016 begins at sundown October 11, and lasts until sundown October 12, is one of the most serious Jewish holidays. Jews who do not regularly observe other holidays often make an exception for Yom Kippur, which occurs on the tenth day of the Hebrew month of Tishri. Yom Kippur observances can vary. Some non-Orthodox Jews might not follow the following outline exactly.